1. Dean’s Blue Hole, Long Island, Bahamas – 660 ft deep.

A “blue hole” is a large hole whose entrance is below sea level. This one in particular is the deepest saltwater blue hole in the world. It’s almost twice the depth of most others. (There’s no word on who Dean is and why he made such a horrifyingly big hole in the planet, though.)

2. Mount Baldy Sink Hole, Indiana – 11 feet deep.

These weird, Sarlacc-pit-looking sink holes are starting to appear around the Mount Baldy Sand Dune near Lake Michigan. One sink hole even swallowed a child in 2011. Luckily, after three hours, he was dug out of the pit (otherwise he surely would have met the same fate as Boba Fett).

4. Great Blue Hole, Belize – 407 ft deep.

This hole was made famous by Jacques Cousteau, who said it was one of the top scuba diving sites in the world. You can take a tour and dive in, if you’re not scared of giant, Pacific Rim monster-aliens from another dimension portaling through.